Strain-rate sensitivity of unstable localized phase transformation phenomenon in shape memory alloys using a non-local model

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:63

Article

Ahmadian, Hossein¹  Ardakani, Saeed Hatefi¹  Mohammadi, Soheil¹ 

[1] Univ Tehran, Sch Civil Engn, High Performance Comp Lab HPC Lab, Tehran, Iran

关键词: Shape memory alloys;    Phase transformation;    Softening;    Thermo-mechanical coupling;   

DOI  :  10.1016/j.ijsolstr.2015.02.049

来源: Elsevier

【 摘 要 】

In this work, the original local model of Boyd and Lagoudas (1996) has been extended by proposing a new softening function to examine the localized macro behavior resulted from unstable phase transformation phenomenon in thin sheets of shape memory alloys (SMAs). In addition, an integral type non-local softening model is adopted to overcome the mesh dependency problem of local softening models. Due to strong thermo-mechanical coupling in SMAs, a staggered scheme has been used to take into account the coupling effects on material behavior. Inclusion of such effects has revealed that instability induced by unstable phase transformation could be surmounted by increasing the strain rate. The simulations have been verified against the available experimental and numerical data, showing a good agreement. (C) 2015 Elsevier Ltd. All rights reserved.

【 授权许可】

Free